Impacts of background wind on the interactions between urban breeze circulation and convective cells: Ensemble large‐eddy simulations

Seong‐Ho Hong; Han‐Gyul Jin; Jong-Jin Baik

doi:10.1002/qj.4657

journal article Feb 07, 2024

Impacts of background wind on the interactions between urban breeze circulation and convective cells: Ensemble large‐eddy simulations

Seong‐Ho Hong Han‐Gyul Jin Jong-Jin Baik

Quarterly Journal of the Royal Meteorological Society Vol. 150 No. 760 pp. 1518-1537 · Wiley

View at Publisher Save 10.1002/qj.4657

Abstract

AbstractUrban breeze is produced by the temperature difference between urban and surrounding rural areas, and its interactions with other atmospheric phenomena are of great interest. In this study, the impacts of background wind on the interactions between urban breeze circulation (UBC) and convective cells are numerically investigated. For this, a large number of idealized ensemble simulations are performed using the Weather Research and Forecasting‐large‐eddy simulation model, where the initial background wind speed varies from 0 to 5 m·s−1 in 0.5 m·s−1 intervals. As the background wind speed increases, the location of the strongest updraft moves from the urban center to the downwind boundary of the urban area. This is associated with different interactions between the UBC and convective cells under different background wind speeds. For no background wind, the UBC is relatively strong and its center is located at the urban center, producing a strong updraft there. Convective cells are advected toward the UBC center and merge with the strong updraft, further intensifying it. For weak background wind, the UBC is relatively weak and its center is located near the downwind urban boundary. Convective cells passing the urban area merge with each other and intensify, and after they pass the downwind urban boundary, the strong vertical wind shear in the right part of the UBC tilts and weakens them. For strong background wind, the UBC is very weak and convective cells are advected mainly by the strong background wind. These changes in the characteristics of convective cells in and around the urban area with background wind speed may lead to the changes in the preferred location of cloud initiation and cloud development.

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Metrics

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Citations

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References

Details

Published: Feb 07, 2024
Vol/Issue: 150(760)
Pages: 1518-1537
License: View

Authors

S

Seong‐Ho Hong

School of Earth and Environmental Sciences Seoul National University Seoul South Korea

H

Han‐Gyul Jin

Department of Atmospheric Sciences Pusan National University Busan South Korea

J

Jong-Jin Baik

School of Earth and Environmental Sciences Seoul National University Seoul South Korea

Funding

National Research Foundation of Korea Award: 2021R1A2C1007044

Cite This Article

Seong‐Ho Hong, Han‐Gyul Jin, Jong-Jin Baik (2024). Impacts of background wind on the interactions between urban breeze circulation and convective cells: Ensemble large‐eddy simulations. Quarterly Journal of the Royal Meteorological Society, 150(760), 1518-1537. https://doi.org/10.1002/qj.4657

Impacts of background wind on the interactions between urban breeze circulation and convective cells: Ensemble large‐eddy simulations

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